[Qemu-devel] [PATCH v3 2/2] hw/arm/virt-acpi-build: Add SPCR table

[Andrew Jones <drjones@redhat.com>]

Signed-off-by: Andrew Jones <drjones@redhat.com>
Tested-by: Shannon Zhao <shannon.zhao@linaro.org>
---
 hw/arm/virt-acpi-build.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index a9373ccaca6cb..d5a8b9c0178ea 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -84,6 +84,12 @@ static void acpi_dsdt_add_uart(Aml *scope, const MemMapEntry *uart_memmap,
                aml_interrupt(AML_CONSUMER, AML_LEVEL, AML_ACTIVE_HIGH,
                              AML_EXCLUSIVE, uart_irq));
     aml_append(dev, aml_name_decl("_CRS", crs));
+
+    /* The _ADR entry is used to link this device to the UART described
+     * in the SPCR table, i.e. SPCR.base_address.address == _ADR.
+     */
+    aml_append(dev, aml_name_decl("_ADR", aml_int(uart_memmap->base)));
+
     aml_append(scope, dev);
 }
 
@@ -334,6 +340,38 @@ build_rsdp(GArray *rsdp_table, GArray *linker, unsigned rsdt)
 }
 
 static void
+build_spcr(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info)
+{
+    AcpiSerialPortConsoleRedirection *spcr;
+    const MemMapEntry *uart_memmap = &guest_info->memmap[VIRT_UART];
+    int irq = guest_info->irqmap[VIRT_UART] + ARM_SPI_BASE;
+
+    spcr = acpi_data_push(table_data, sizeof(*spcr));
+
+    spcr->interface_type = 0x3;    /* ARM PL011 UART */
+
+    spcr->base_address.space_id = AML_SYSTEM_MEMORY;
+    spcr->base_address.bit_width = 8;
+    spcr->base_address.bit_offset = 0;
+    spcr->base_address.access_width = 1;
+    spcr->base_address.address = cpu_to_le64(uart_memmap->base);
+
+    spcr->interrupt_types = (1 << 3); /* Bit[3] ARMH GIC interrupt */
+    spcr->gsi = cpu_to_le32(irq);  /* Global System Interrupt */
+
+    spcr->baud = 3;                /* Baud Rate: 3 = 9600 */
+    spcr->parity = 0;              /* No Parity */
+    spcr->stopbits = 1;            /* 1 Stop bit */
+    spcr->flowctrl = (1 << 1);     /* Bit[1] = RTS/CTS hardware flow control */
+    spcr->term_type = 0;           /* Terminal Type: 0 = VT100 */
+
+    spcr->pci_device_id = 0xffff;  /* PCI Device ID: not a PCI device */
+    spcr->pci_vendor_id = 0xffff;  /* PCI Vendor ID: not a PCI device */
+
+    build_header(linker, table_data, (void *)spcr, "SPCR", sizeof(*spcr), 2);
+}
+
+static void
 build_mcfg(GArray *table_data, GArray *linker, VirtGuestInfo *guest_info)
 {
     AcpiTableMcfg *mcfg;
@@ -514,7 +552,7 @@ void virt_acpi_build(VirtGuestInfo *guest_info, AcpiBuildTables *tables)
     dsdt = tables_blob->len;
     build_dsdt(tables_blob, tables->linker, guest_info);
 
-    /* FADT MADT GTDT pointed to by RSDT */
+    /* FADT MADT GTDT SPCR pointed to by RSDT */
     acpi_add_table(table_offsets, tables_blob);
     build_fadt(tables_blob, tables->linker, dsdt);
 
@@ -527,6 +565,9 @@ void virt_acpi_build(VirtGuestInfo *guest_info, AcpiBuildTables *tables)
     acpi_add_table(table_offsets, tables_blob);
     build_mcfg(tables_blob, tables->linker, guest_info);
 
+    acpi_add_table(table_offsets, tables_blob);
+    build_spcr(tables_blob, tables->linker, guest_info);
+
     /* RSDT is pointed to by RSDP */
     rsdt = tables_blob->len;
     build_rsdt(tables_blob, tables->linker, table_offsets);
-- 
1.8.3.1